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Renal hyperfiltration is a determinant of endothelial function responses to cyclooxygenase 2 inhibition in type 1

David Z I Cherney1, Judith A Miller, James W Scholey

  • 1Division of Nephrology, Toronto General Hospital, University of Toronto, Toronto, Ontario, Canada. david.cherney@uhn.on.ca

Diabetes Care
|March 25, 2010
PubMed
Abstract

Insights

Cyclooxygenase 2 (COX2) inhibition impacts endothelial function differently in type 1 diabetes patients based on their renal filtration status, suggesting broader endothelial dysfunction.

Area of Science:

  • Cardiovascular Research
  • Nephrology
  • Endocrinology

Background:

  • Endothelial dysfunction is a key complication in type 1 diabetes.
  • Renal hyperfiltration is a marker of early kidney damage in diabetes.
  • The role of cyclooxygenase 2 (COX2) in diabetic endothelial function requires further elucidation.

Purpose of the Study:

  • To investigate the effect of COX2 inhibition on endothelial function in type 1 diabetes.
  • To analyze these effects based on the renal filtration status (hyperfiltration vs. normofiltration).

Main Methods:

  • Flow-mediated dilation (FMD) was measured in type 1 diabetic subjects with hyperfiltration (GFR ≥135 ml/min/1.73 m²) and normofiltration (GFR <135 ml/min/1.73 m²).
  • Studies were conducted before and after a 14-day course of celecoxib (200 mg daily).
  • Measurements were performed under both euglycemic and hyperglycemic conditions.

Main Results:

  • Baseline FMD was significantly higher in normofiltering subjects compared to hyperfiltering subjects during euglycemia.
  • COX2 inhibition with celecoxib markedly suppressed FMD in normofiltering individuals.
  • Conversely, COX2 inhibition had a less pronounced effect on FMD in hyperfiltering subjects, indicating an interaction with filtration status.

Conclusions:

  • Endothelial function response to COX2 inhibition in type 1 diabetes is significantly influenced by renal filtration status.
  • These findings suggest that filtration status may reflect underlying, generalized endothelial dysfunction in diabetic patients.
  • Targeting COX2 pathways may have differential effects on vascular health depending on diabetic nephropathy progression.

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